Alastair Culham is a British botanist. He is a member of the staff of the School of Biological Sciences at the University of Reading and Curator of the University of Reading Herbarium. He specialises in plant taxonomy, biosystematics and applications of techniques from molecular biology, phytogeography and phylogenetics. He focuses on broad-based research in biodiversity and taxonomy.
One aspect of his research concerns the effects of climate change on biodiversity, especially that of ornamental and edible plants. He has contributed to papers on the impacts of climate change on plant evolution as well as reviews of data source quality and computational approaches to large-scale niche modelling.